---
product_id: 68014327
title: "Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers"
brand: "fosi audio"
price: "R$2152"
currency: BRL
in_stock: true
reviews_count: 13
category: "Fosi Audio"
url: https://www.desertcart.com.br/products/68014327-fosi-audio-bt20a-bluetooth-amplifier-for-speakers-mini-stereo-2
store_origin: BR
region: Brazil
---

# Bluetooth 5.0, 50ft range 100W x 2 power output Bass & Treble analog controls Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers

**Brand:** fosi audio
**Price:** R$2152
**Availability:** ✅ In Stock

## Summary

> 🎧 Elevate your sound game—small amp, massive impact!

## Quick Answers

- **What is this?** Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers by fosi audio
- **How much does it cost?** R$2152 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/products/68014327-fosi-audio-bt20a-bluetooth-amplifier-for-speakers-mini-stereo-2)

## Best For

- fosi audio enthusiasts

## Why This Product

- Trusted fosi audio brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Compact Yet Mighty:** Space-saving metal chassis fits discreetly in any setup without compromising durability or style.
- • **Powerhouse Performance:** Dual 100W channels deliver room-filling, crystal-clear sound that commands attention.
- • **Audiophile-Grade Clarity:** TI TPA3116D2 chips minimize distortion (<0.04% THD) for pristine highs and deep, punchy lows.
- • **Seamless Wireless Freedom:** Bluetooth 5.0 connectivity ensures effortless streaming up to 50 feet—ditch the cables, not the quality.
- • **Tailored Audio Experience:** Integrated bass and treble controls let you customize your soundscape with precision and ease.

## Overview

The Fosi Audio BT20A is a compact, high-performance Bluetooth 5.0 stereo amplifier delivering 100W per channel with ultra-low distortion. Featuring TI TPA3116D2 chips, bass and treble controls, and a durable metal build, it effortlessly powers passive speakers for immersive home or outdoor audio. With a 50ft wireless range and 2-year warranty, it’s the perfect blend of convenience, quality, and style for discerning audiophiles.

## Description

Product Description Bluetooth 5.0 Mini Power Amplifier Fosi Audio was founded with a simple goal: Build products that sound great and make people want to listen to music every day. We design and have many Hi-Fi audio products on the market. We pursue your perfect music journey. Enjoy Hi-Fi music with Fosi Audio products. Product Parameters 2.0 Channel Bluetooth 5.0 Stereo Power Amplifier Power Adapter: 24V/4.5A, DC Input Range: 12-24V MAX Power Output: 100W x 2, Terminating Impedance: 2 Ohm - 8 Ohm THD ≤ 0.04%, SNR ≥ 98dB, Input Sensitivity ≤ 280mV Frequency Range: 20Hz - 20kHz (±1 dB), Input Mode: Bluetooth and RCA Bluetooth Transmission Distance: Up to 50 Ft up to 50ft connection Bluetooth Receiver Amplifier Instant setup with phones, tablets, and almost any other Bluetooth-enabled device. easy to fit your system with Bass and Treble Control Exclusively designed for the customers who pursue HiFi sound. MAX power output 100W*2 Simple Compact Design but Practical and Powerful 100 watt per channel power output can drive most home passive speakers to create astonishing Sound. made for audiophile Extraordinary Clarity Hi-Fi Sound Even at high volumes, there’s less than 0.04% harmonic distortion resulting in remarkable clarity. for bookshelf speakers 2.0 Channel Wireless Stereo Amplifier Easy to fit your audio system with Bluetooth and RCA input. TI TPA3116D2 Chip Advanced Circuitry Architecture The Texas Instruments TPA3116D2 Chip presents music with rousing highs and deep lows. Safe DC Outlet With a built-in power protection circuit, there are no sparks flying when you plug the power adapter into the amplifier. Safe for use! 24V/4.5A Power Supply Fosi Audio BT20A equip with an energy-efficient and stable power supply can get an astonishing sound. Fosi Audio Amplifiers Comparison BT20A BT20A MAX BT20A PRO BT30D BT30D PRO V3 TB10D

Review: Very Good Little Amp - I am quite picky and want a clean, high-quality sound with plenty of volume when it comes to hifi. This is a very compact little amp (40mm high, 120mm wide and 160mm deep). It has a good quality feel and a reasonable weight to it. I am using it to drive 2 Q Acoustic Speakers (2020i) that are rated 75 watts at 6 Ohms. I have the amp connected via banana plugs. I would say the amp matches these really well and drives the speakers fully. Not too much and not too little. At max volume there is a touch of distortion but not that much and honestly whilst I do like loud music, I would not really want my music that loud in the kitchen, I have another set up for that elsewhere. The treble and base adjustment may in some ways seem old fashioned but I really like them as you can give it a little more base or treble depending on your speakers, the music and of course your personal preference. You can get graphic equalisers to add to your phone, etc, but the on-amp adjustment just seems more accessible. I am not using the bass driver and honestly I do not think I will. So why did I buy this amp when Fosi do a version with no bass driver? Well, desertcart had a discount that made this version only £5 more than the non-bass driver version. Another reason though was that this comes with a 32 volt power supply and the non-bass driver version ships with the 24 volt supply but can be upgraded to the 48 volt supply. This means you will not get full performance if you only buy the one that ships with 24 volt supply. You can upgrade on the Fosi website but not on the desertcart website. You can buy the 48volt power supply separately on desertcart but this pushes the price up quite a bit. So, therefore I preferred this slightly higher spec model that ships with the 32 volt supply from desertcart and this is the max supply allowed for this unit, I think. That was my logic and it would be interesting to know what Fosi themselves think about this and whether my deductions were correct. I think Fosi should add the 48 volt power supply option to the non-bass driver unit on desertcart. I use this in my kitchen and for me a key selling point is the size. I have built it in to the bottom of one of my kitchen cupboards and of course its small size means it is very discrete. The Bluetooth works fine. Still good volume. It connects easily and makes a little bleep to signal connection. You can also connect directly if you have the right cables. The sound quality and volume are marginally higher and cleaner when connected directly, but the Bluetooth still sounds good. My arrangement slightly compromises the view to the Bluetooth antenna, which I have rotated so it is exposed somewhat. This does not seem to make much difference and the range is still fine. I am using it with iPads, iPhones and Samsung phones. All work fine. So I am very happy with this Fosi unit but I would recommend you look at their full range, perhaps on their website before you decide the best one for you. I went for desertcart because I knew it would come quickly and be an easy return if I did not like it. I am a bit shocked and pleasantly surprised that such a tiny and affordable little unit can be so good. Well done Fosi. (Ultimately I decided to get the non-bass model with the 48 volt power supply. This does give slightly greater volume with less distortion which is why I have updated this review.)
Review: Incredible - Arrived in a fair sized box - then you open it and go 'No way'. It's tiny, maybe as big as 2 Nurofen packets on top of each other. Is this gonna make any sound at all? (I'm used to 19 inch Cambridge amps etc). Well flippin eck, it does. I was gonna use it to power the sound on my tv, a Hisense, into Gale bookshelf speakers, which can sound amazing. All you do is attach the speaker cable, then the tv and the Fosi amp found each other straight away via Bluetooth...and boom. Big sound, happily supplying the speakers with all they needed. And it sounds great! I just set the unit's volume to 12 o'clock and control the level via the tv remote, never touch it. For £60 this thing is startlingly good, and let's be honest cheap as chips.

## Features

- 【Bluetooth 5.0】Featuring an integrated Bluetooth ATS2853 chip, this bluetooth amplifier supports streaming up to 50ft (15m). Effortlessly connect via Bluetooth to enjoy high-quality music from MP3, Phone, Pad, PC, or Laptop, embracing the wireless era.
- 【Compact Design】Our mini amplifier offers a sturdy, space-saving design for home, office, or outdoor use. Elevate your audio experience with bass and treble controls to tweak settings as needed.
- 【Immersive Audio Quality】Elevate your audio environment with room-filling sound, driven by a total output of 100W x 2 at 4 ohms. Covering a wide frequency range of 20Hz - 20kHz with less than 0.04% THD, achieve the perfect balance of volume and detail for an unparalleled home entertainment experience.
- 【Superior Sound】Utilizing 2 integrated Classic TI TPA3116D2 chips, this device provides crisp, clean sound with crystal-clear highs and smooth, pure bass. It enhances voice clarity and speaker performance while maintaining lower energy consumption.
- 【 Exquisite Craftsmanship】This power amplifier comes nicely packaged with a solid feel to the case and the controls and connectors. The all-metal body ensures durability, and you can enjoy the peace of mind provided by Fosi Audio's 24-month warranty.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07BQC7GNL |
| Best Sellers Rank | 2,049 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 2 in Hi-Fi Amplifiers |
| Box Contents | Bluetooth Antenna x1, 32V 5A Power Supply x1 |
| Brand Name | Fosi Audio |
| Country of Origin | China |
| Customer Reviews | 4.6 out of 5 stars 18,010 Reviews |
| Item Weight | 567 Grams |
| Manufacturer | Fosi Audio |
| Manufacturer Part Number | BT20A |
| Model Number | BT20A |
| Product Warranty | 2 years |
| Unit Count | 1.0 count |

## Product Details

- **Item dimensions L x W x H:** 13.2 x 9 x 3.6 centimetres
- **Manufacturer:** Fosi Audio
- **Maximum supply voltage:** 24 Volts
- **Minimum supply voltage:** 12 Volts
- **Voltage:** 230 Volts

## Images

![Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers - Image 1](https://m.media-amazon.com/images/I/61+cd+AMZcL.jpg)
![Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers - Image 2](https://m.media-amazon.com/images/I/71OPBXwFnKL.jpg)
![Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers - Image 3](https://m.media-amazon.com/images/I/71ZEBQfaP+L.jpg)
![Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers - Image 4](https://m.media-amazon.com/images/I/71qYzSzMSJL.jpg)
![Fosi Audio BT20A Bluetooth Amplifier for Speakers, Mini Stereo 2 Channel Amp Class D, with TPA3116 Chips 100W x 2 and Bass Treble Controls, for Home Audio Outdoor Passive Desktop Bookshelf Speakers - Image 5](https://m.media-amazon.com/images/I/71yoVO+BNVL.jpg)

## Available Options

This product comes in different **Color** options.

## Questions & Answers

**Q: Can these be connected to skytronic 125.061 100w 4ohm ceiling speakers?**
A: not sure.i have them connected to jbl 100 w speakers. copes fine

**Q: Can I use it for 2 Technics speakers, 3way, 6ohm, 100w each?**
A: I've got it wired to my old Gale Gold Mark 2, rated 6-8 ohms 100w I think? Sounds great!

**Q: I want to use a 12v adapter. What size adapter pin/head is required? I have tried a few spares that I had, but none of them fit.**
A: OD: 5.5mm; ID: 2.5mm
BT20A comes with a 24V adapter, you can find one like its size.

**Q: Can a technics direct drive turntable work via the rca input or does the turntable need a preamp?**
A: The input sensitivity is stated as less than or equal to 280mV. If your turntable outputs I similar voltage (I guess in the range of 150 to 280mV) then I would say you probably don't need a preamp. However, if it's output is a lot less, you will need a preamp. Fosi have a range of turntable preamps to choose from. Look up the specs of your turntable to find it's output voltage range. Hope that helps.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Very Good Little Amp
*by S***R on 22 February 2024*

I am quite picky and want a clean, high-quality sound with plenty of volume when it comes to hifi. This is a very compact little amp (40mm high, 120mm wide and 160mm deep). It has a good quality feel and a reasonable weight to it. I am using it to drive 2 Q Acoustic Speakers (2020i) that are rated 75 watts at 6 Ohms. I have the amp connected via banana plugs. I would say the amp matches these really well and drives the speakers fully. Not too much and not too little. At max volume there is a touch of distortion but not that much and honestly whilst I do like loud music, I would not really want my music that loud in the kitchen, I have another set up for that elsewhere. The treble and base adjustment may in some ways seem old fashioned but I really like them as you can give it a little more base or treble depending on your speakers, the music and of course your personal preference. You can get graphic equalisers to add to your phone, etc, but the on-amp adjustment just seems more accessible. I am not using the bass driver and honestly I do not think I will. So why did I buy this amp when Fosi do a version with no bass driver? Well, Amazon had a discount that made this version only £5 more than the non-bass driver version. Another reason though was that this comes with a 32 volt power supply and the non-bass driver version ships with the 24 volt supply but can be upgraded to the 48 volt supply. This means you will not get full performance if you only buy the one that ships with 24 volt supply. You can upgrade on the Fosi website but not on the Amazon website. You can buy the 48volt power supply separately on Amazon but this pushes the price up quite a bit. So, therefore I preferred this slightly higher spec model that ships with the 32 volt supply from Amazon and this is the max supply allowed for this unit, I think. That was my logic and it would be interesting to know what Fosi themselves think about this and whether my deductions were correct. I think Fosi should add the 48 volt power supply option to the non-bass driver unit on Amazon. I use this in my kitchen and for me a key selling point is the size. I have built it in to the bottom of one of my kitchen cupboards and of course its small size means it is very discrete. The Bluetooth works fine. Still good volume. It connects easily and makes a little bleep to signal connection. You can also connect directly if you have the right cables. The sound quality and volume are marginally higher and cleaner when connected directly, but the Bluetooth still sounds good. My arrangement slightly compromises the view to the Bluetooth antenna, which I have rotated so it is exposed somewhat. This does not seem to make much difference and the range is still fine. I am using it with iPads, iPhones and Samsung phones. All work fine. So I am very happy with this Fosi unit but I would recommend you look at their full range, perhaps on their website before you decide the best one for you. I went for Amazon because I knew it would come quickly and be an easy return if I did not like it. I am a bit shocked and pleasantly surprised that such a tiny and affordable little unit can be so good. Well done Fosi. (Ultimately I decided to get the non-bass model with the 48 volt power supply. This does give slightly greater volume with less distortion which is why I have updated this review.)

### ⭐⭐⭐⭐⭐ Incredible
*by R***E on 11 March 2026*

Arrived in a fair sized box - then you open it and go 'No way'. It's tiny, maybe as big as 2 Nurofen packets on top of each other. Is this gonna make any sound at all? (I'm used to 19 inch Cambridge amps etc). Well flippin eck, it does. I was gonna use it to power the sound on my tv, a Hisense, into Gale bookshelf speakers, which can sound amazing. All you do is attach the speaker cable, then the tv and the Fosi amp found each other straight away via Bluetooth...and boom. Big sound, happily supplying the speakers with all they needed. And it sounds great! I just set the unit's volume to 12 o'clock and control the level via the tv remote, never touch it. For £60 this thing is startlingly good, and let's be honest cheap as chips.

### ⭐⭐⭐⭐⭐ Great compact amplifier
*by J***H on 14 May 2024*

Last year I had bought a Tangent Ampster BT II amplifier, which had worked great, however it recently had an issue with the power switch, so had to be sent away for repair. As I used it in my office I needed a replacement and decided to order this amplifier. I thought the Tangent Ampster was small, but this BT20A amplifier is ridiculously small! This is mainly as the power supply is external to the amplifier, which itself is bigger than the amplifier. I have it connected to a pair of Mission LX-1 MKII speakers, and I am happy to say that this amplifier easily runs these speakers, with no sign of distortion. I appreciate the treble and bass controls, as by default the treble did sound lacking and a bit stifled. The dials are nice and smooth, and the power switch toggle works without issue. At this size and price you only get 1 set of RCA inputs and 1 set of speaker outputs, but for my use case this is fine. Bluetooth works seamlessly, and the audio quality is about on par with direct RCA connection. Be aware that if you connect via bluetooth it will override the RCA input, even with no music played over bluetooth. I will say, as others have, that being able to connect to the amplifier via bluetooth without being asked for a code is a potential issue, I live in a block of apartments, so anyone could connect to it if they tried. I don't hear any hissing when not playing music, so that is another plus. Overall a great little amplifier for the price, once my other amp is back from repair I will probably relegate that to the living room as it has a remote control that is more useful.

## Frequently Bought Together

- Fosi Audio BT20A Bluetooth Stereo Amplifier, 2 Channel Home Audio Component Amplifiers for Passive Speakers, Mini Class D Amp Receiver 200W for Indoor/Outdoor/Garage/Ceiling/Bookshelf Speaker
- Banana Plugs with Dual Set Screws,Black and Red Aluminum Shell,6 Pairs
- Amazon Basics Speaker Cable, Easy Assembly, 16-Gauge, Bronze, 100 ft

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-07-08*